Bit heating apparatus



May 30, 1939. l.. A. GALAMBos, JR 2,160,265 BIT HEATING APPARATUS FiledNov. 20, 1956 2 Sheets-Sheet 1 Hyg 502x225 GaZamaSJ/i May 30, 1939. L.A. GALAMBos, JR 2,160,265

`BIT HEATING APPARATUS Filed Nov. 2o, 195e `2 sheets-sheet 2 PatentedMay 30, 1939 Louis A. Galambos, Jr., Kansas City,

to Sullivan Machinery Company,

STATES PATENT OFFICE BIT HEATING APPARATUS of Massachusetts ApplicationNovember 2l), 1936, Serial No. 111,894

This invention relates to f 3 Claims.

urnaces, and more particularly to improvements in furnaces for heatingmining machine cutter bits and means for supporting and conveying thebits with respect to the furnace.

An object of this invention is to provide an improved furnace forheating rn ining machine cutter bits preparatory to the hard facing ofthe bit cutting points.

Another object is to provide an impro-ved supporting and conveying meansfor supporting the bits and for with respect to the furnace.

conveying the b-its Other objects and advantages of the invention will,however, hereinafter more fully appear.

In the accompanying drawings there is shown for purposes of illustrationone form which the invention may assume in practice.

In these drawings,-

Fig. 1 is a plan View of the improved furnace and the associated bitsuppor means.

ting and conveying Fig. 2 is a side elevational view of the furnace andbit supporting and conveying means shown in Fig. 1.

Fig. 3 is a vertical sectional view taken substantially on line 3-3 ofFig.

Fig. 4 is a horizontal sectional view taken substantially on line 4--4of Fig.

Fig. 5 is a perspective View of a mining machine cutter bit of improvedform, adapted to use with the improved furnace and bit supporting andconveying means.

Fig. 6 is a side elevational view of the improved cutter bit.

In this illustrative embodiment of the invention there is shown afurnace generally designated I,ha.ving associated therewith an improvedbit supporting and conveyin designated 2. The furnace I g meansgenerally comprises a casing 3 of generally rectangular form mounted ona support i and lined internally form a heating chamber 6.

with fire brick 5 to This heating chamber has a lateral flue-opening 1,and a combustible mixture is supplied to the heating chamber by aconventional burner 8.

Now referring to the improved bit supporting it will be noted that a Illhas journaled thereherein in the form secured near the nnular bitsupport ded with relatively I4 and l5, so that the bits generallydesignated I6 are supported thereon in the inclined positi on, as shownmost Mo., assigner a corporation clearly in Fig. 3, with the cuttingportions I1 of the bits located neary the outer rim of the annularsupport.

In Fig. 5 there is shown a cutter bit of an improved type comprising ausual shank I8 and a relatively inclined portion i9 on which the cuttingportion'il is formed. The cutting portion Il of the bit is preferablyformed on a forging machine o-f the type disclosed in the patent to S.T. Nelson, 1,650,580, patented Nov. 22, 1927, and the cutter bit hereinis generally similar to that disclosed in the S. T. Nelson patent, No.1,679,049, patented July 31, 1928. In this instance, the forward cuttingface of the bit is formed with a double taper at E and 2l to ob- 15 tainincreased strength, and a. hard abrasive material is applied to theouter inclined surface 2l at 22 to increase the wearing qualities of"the bit cutting point. It will be evident that the cutter bitused'herein may be formed in any suitable manner and that bits of typesother than that disclosed may be heated and hard faced in accordancewith the present invention, although the bit disclosed, due to itsimproved design, is preferable to other known types. 25

The cutter bits to be heated, subsequent to the forming or sharpeningprocess, are placed on the revoluble table in the manner clearly shownin Fig. 2, with the bit Shanks engaging the inclined surface i5 of theannular support and the receding surfaces of the cutting portions of thebit engaging the relatively inclined surface I4 of the sup-port. Whenthe bits are so arranged, the inclined surface 2i of the bit is locatednear the outer rim of the annular support. As the bits are placed on theannular support, the table is rotated so as to move the bits within theheating chamber 6 of the furnace, the annular support for the bitsmoving within the lateral flue opening of the heating chamber in themanner shown in Fig. 3, so that the cutting portions of the bit aresubjected to the direct heat of the furnace. When the cutting portionsof the bits are heated to the proper temperature, the table is revolvedto move the bits from the heating chamber of the furnace, and as thebits are moved from the furnace the operator applies, by means of anacetylene torch, a hard abrasive substance to the faces 2l of thecutting portions of the bits, the bits being supported on the annularsupport in the inclined position above mentioned, so that the cuttingportions of the bits are presented in a more convenient manner, therebyto facilitate the application of the hard faces to the bits.

As a result of this invention, it will be noted that an improved bitheating furnace, together with an improved bit supporting and conveyingmeans is provided whereby the heating process is substantiallycontinuous, and as the heated bits are discharged from the furnace, theyare supported in position convenient for hard tipping, the operatorapplying a hard abrasive substance to the bit points as the bits aredischarged from the furnace. It will further be noted that by theprovision of the improved bit supporting and conveying means the bitsare moved in an improved manner with respect to the furnace, and aresupported in an inclined position in an improved manner to facilitatethe hard facing of the cutting points. t will also be noted that theimproved bit supporting and conveying means and the associated furnaceare of an extremely simple and rugged design which may be manufacturedat a minimum of expense. Other uses and advantages of the improvedfurnace and bit supporting and conveying means will be clearly apparentto those skilled in the art.

While there is in this application specically described one form whichthe invention may assume in practice, it will be understood that thisform of the same is shown for purposes of illustration and that theinvention may be modified and embodied in various other forms withoutdeparting from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

l. In a bit heating apparatus, the combination of a furnace having aheating chamber provided with a horizontal opening curved inwardly inplan for receiving the bits to be heated, and a horizontal rotarycarrier having a portion annular in plan disposed at one side inadjacency to said chamber opening and shaped to conform to said curvedchamber opening for providing a closure for the chamber opening, saidannular carrier portion having at its exterior periphery an annular bitsupport for supporting a series of the bits to be heated, said carrierupon rotation thereof moving the bits to be heated within said furnaceheating chamber, said annular carrier portion serving both as a bitsupport and a closure for said chamber opening.

2. In a bit heating apparatus, the combination of a furnace having aheating chamber provided with a horizontal opening curved inwardly inplan for receiving the bits to be heated, and a horizontal rotarycarrier having a portion annular in plan disposed at one side inadjacency to said chamber opening and shaped to conform to said curvedchamber opening for providing a closure for the chamber opening, saidannular carrier portion having at its exterior periphery an annular bitsupport providing relatively inclined supporting surfaces for supportinga series of the bits to be heated in an inclined position with the lowerportions of the bits nearer the outer periphery of said carrier, saidcarrier upon rotation thereof moving the bits to be heated within saidfurnace heating chamber, said annular carrier portion serving both as abit support and a closure for said chamber opening.

3. In a bit heating apparatus, the combination ofA a furnace having aheating chamber provided with a horizontal opening curved inwardly inplan for receiving the bits to be heated, and a horizontal rotarycarrier having a portion annular in plan disposed at one side inadjacency to said chamber opening and shaped to conform to said curvedchamber opening for providing a closure for the chamber opening, saidannular carrier portion having at its exterior periphery an annular bitsupport providing relatively inclined supporting surfaces for supportinga series of the bits to be heated in an inclined position with thecutting portions of the bits located nearer the outer periphery of saidcarrier, said carrier upon rotation thereof moving the cutting portionsof the bits to be heated within said furnace heating chamber, saidannular carrier portion serving both as a bit support and a closure forsaid chamber opening.

LOUIS A. GALAMBOS, JR.

